Multi Fire Plug Wires Cylinder Head-to-Head Ground Wire
This ground wire connects the left and right cylinder heads to help ensure both heads have a solid, consistent ground. Proper cylinder head grounding can help provide a strong electrical path for the ignition system and consistent spark at the spark plugs.
For best results, we also recommend running a separate ground wire from the engine to the negative side of the battery.
Important: A good engine grounding system is an important part of proper ignition system performance, especially in race car applications.
